This site features a great message board with reviews of bars and girls in San Jose (click on forum in upper navigation bar). It's the number one bookmark for gentlemen doing research for a Costa Rica sex vacation. Most mongers on this board are very friendly and happy to share their experienced about the massage parlor girls, strip clubs and freelancers from various sources.
Published by online newspaper Tico Time, this page presents a spiffy listing of Costa Rican stripclubs in San Jose. Most look like holes in the walls from outside, but many attendees and intimate experts of Latin American strip joints will confess they contain some of the hottest exotic dancers in the Americas. It's amazing to have fun in some of these places. Please, do your research on local CR boards and stripclub forums about each club to get the latest reviews.
This website offered an ebook about prostitution in Costa Rica. Kind of a strange way of retrieving information about Central American sex workers, but maybe the author does not want his info to be distributed for free. I have never looked into the ebook, but it might be worth the small fee compared to the amounts of money newbie gringos tend to throw around with on their maiden trip to CR.